Piston-packing ring.



T. H. RENAUD, PISTON PACKING RING.

Patented Nov. 30, 1909.

"barren snares Parana oration THOMAS H. RENAUD, OF ST. LOUIS, MISSOURI,ASSIGNOR OF ONE-THIRD T0 WILLIAM BAWDEN AND ONE-THIRD 'IO EDWARD L.ADREON, JR., OF ST. LOUIS, MISSOURI.

PISTON -PACKING RING.

Specification of Letters Patent. Patented Nov. 30, 11909.

Application filed April 3, 1908. Serial No. 425,039. I

To all whom 'it may concern:

Be it known that I, THOMAS H. RENAUD, citizen of the United States, andresident of St. Louis, Missouri, have invented certain new and usefulImprovements in Pistonlacking Rings, of which the following is aspecification containing a full, clear, and ex.- act description,.reference being had to the accompanying drawings, forming a parthereof.

My invention relates to a piston packing ring, the object of myinvention being to construct a simple, inexpensive packing ring adaptedto be seated in the periphery of a piston, and which ring iscontinuously forced outward against the inner surface of the cylinder inwhich the piston is operating, in

- with the pitson therein, and showing the piston equipped withmyimproved packing rings; Fig. 2 is an enlarged section takenapproximately on the line 2-2 of Fig. 1;

Fig. 3 is a horizontal section taken approximately on the line 33 ofFig. 2; Fig. 4 is a detail section taken through the edge of a pistonequipped with a modified form of the packin ring;. and Fig. 5 is aperspective view of one of the Wedge blocksv utilizedin connection withthe packing ring.

Referring by numerals to the accompanying drawings: 1 designates acylinder of ordinary construction, in which is arranged to reciprocatethe usual piston 2, carried on the end of the piston rod 3. Formed inthe periphery ofthe piston is one or more.continuous grooves 1, andformed'in the body of the piston and extending toward the center thereoffrom the bottom of each groove is a pair of oppositely arranged recesses5, and arranged in each groov e, immediatel over these recesses, arewedge blocks 6, eac provided with a pair of oppositely disposed inclinedor beveled faces 7, the outer face 8 of each wedge block being curved toconform with the curvature of the inner face of the cylinder 1. Formedon or fixed to the under side of each wedge block is a pin 9, whichextends into the corresponding recess 5, and located on each pin withinthe recess is an expansive coil spring 10.

Each packing ring is made up of a pair of semicircular sections 11, eachof which sections is rectangular in cross section, and adapted to fitsnugly in the groove 4 and the ends of each section 11 are inclined orbeveled,as designated by 12, in order to correspond with and fit uponthe inclined faces 7 of the wedge blocks 6. The ring sections arepreferably constructed of hard metal, and previous to their being fittedinto the piston the outer faces of said ring sections are turned orformed tofit the inner face of the cylinder. When my improved packingrings are fitted into a plston and said piston is in operation, theexpansive power of the coil springs 10 forces-the Wed e blocks 6 outwarduntil the outer faces 8 0 said wedge blocks bear against the inner faceof the cylinder, and this continuous outward presconstructed in twosections, and, as the pres-v sure on both sections is equal, the wearupon the peripheries of the ring sections and upon the inner surface ofthe cylinder is equalized. When two or more packin ranged in a piston,the bloc s 6 of the adjacent rings are offset or staggered relative toone another, thus breaking oint between the ends of the adjacent pairsof the main sections. v y

In Fig. 4 I have shown the pin 9 provided with a head or piston 13,which operates in the recess 5, and formed through the piston andcommunic ting with the end of said recess 5 is an aperture 14, whichadmits steam or other-fluid pressure to the recess rings are ar-'surface of the cylinder is equalized over the entire face or peripheryof said ring.

The ring sections 11, together with the wedge blocks (3, combine to forma complete ring which extends entirely around the eriphery of thepist0n,-and the entire bearing surface of which ring is always incontact with the inner face of the cylinder, thereby forming a perfectpackin which is not available where a split ring is used, owing to thefact that a split ring will gradually expand as the piston and pistonring wears and thus form an opening between the ends of said split ring,through which steam or air can readily pass. In some instances it may befound advantageous to use a single split ring, the ends of which arebeveled, and between which beveled ends is positioned one of the wedgeblocks.

I claim:

1. The combination with a piston head having a continuous groove formedtherein, of a pair of semi-circular packing rings seated in said groove,the inner edges of which are spaced apart from the bottom wall of saidgroove, th ends of eaeh ring being inclined inwardly from its outeredge, a pair of wedge blocks seated in said groove be tween the ends ofsaid semirireular rings which wedge l)l()t'l entirely separate saidsemiircular rings from the outer edge of said blocks. completing thearcs of the circle between said rings, and a spring positioned beneatheach of said wedge blocks for l'oro ing the wedge blocks and the ringpositioned between said \\'edge blot-ks outwardly.

A piston rod packing, comprising a pair of semi-cireular members, theends of whichsemi-cireular members-are beveled in wardly from theirouter edges, wedge-sha ped blocks .arranged between the ends of saidsemi-circular rings and completely separating said rings and the outerface of said blocks completing the circle between the ends of saidrings, and a spring positioiu-d beneath each wedge block for foreing thewedge block and the ring positioned between the wedge blocks outwardly.

In testimony whereof, I have signed my name to this specification, inpresence of two subscribing witnesses.

THOMAS ll. ltl'lNAlll).

Wi tnesses M. 1. SMITH, WM. BAwnnN.

